Design And Implementation Of A Certain Spaceborne Attitude Servo Control System Based On FPGA

The satellite attitude servo control system is one of the main components of the satellite,and its performance plays a key role in the overall operation of the satellite.With the development of satellite load performance index towards high resolution and wide field of view,the requirements of higher spatial resolution on servo control system are increasing.The traditional attitude servo control system has many problems,such as large volume,heavy weight and high failure rate.This paper investigates the load servo control system at home and abroad,and designs a servo control system based on FPGA without current sensor,which has the advantages of light weight and high control precision.The main conclusions and research results are as follows:1.the development of satellite load servo control system at home and abroad is investigated.The control strategy of the direct axis voltage equal to zero is analyzed.The theoretical analysis verifies that the servo system can be applied to the servo system designed in this paper.The model of double closed-loop control system is established from the inside to the outside,which is the rotation speed loop and the position loop respectively,and Simulink is used for simulation,The results show that the designed servo system can meet the expected targets.2.the attitude servo control system is designed.Firstly,FPGA chip is used as the core processor in hardware,absolute grating encoder is used as the position sensor to collect the rotor angle of motor in real time,and the control circuit and driving circuit of the platform are built.Secondly,the position controller,speed controller,operation unit and PWM wave generating unit of servo system are modularized by using Quartus II software in software,and the simulation is carried out in Modelsim.3.the ground simulation experiment platform of the satellite attitude servo control system is built and the experiment of the speed mode and the pointing mode is carried out.The experimental results show that In the case of a rotation speed of 360 degrees per second,the speed stability is better than 1%,and the direction angle is 180 of the case,the pointing accuracy is better than 0.1 °,Meet the preset performance index requirements.